both of stm32h743's usb host support dma?

shark · ‎2021-05-05

hi

On stm32h743, usb hs1 with external phy works perfectly well in dma mode. Its perfoamance and reliability is very good.

But usb hs2 with internal phy not work in dma mode. If I disabled dma mode, it works but not reliable. It's internl fifo sometimes crashed when I output buck data and the device response with nak. I test it by write 20M bytes of mass storage file.

So does the dma is supported for full speed usb device on hs2 controller?

Amel NASRI · ‎2021-05-17

Hi @shark ,

Some known root causes of possible problem when using DMA with USB on STM32H7 are explained in the article: How to correctly setup your application to use USB DMA controller with STM32H7 devices?

Please have a look and make sure that you are applying the recommendations provided there for USB HS2.

-Amel

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